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NMIBC risk group system of recurrence
| Risk grade | Characteristics |
| NMIBC, non-muscle invasive bladder cancer. | |
| Low-risk of recurrence | Single, initial, low-grade, Ta |
| Moderate-risk recurrence | Multiple, recurrent low-grade, Ta |
| High-risk recurrence | Any T1, and/or G3, and/or CIS |
